To encourage the use of natural gas vehicles and the establishment of
the growing fueling infrastructure across North America, the companies
will bundle the Westport™ LNG Tank System - optimized for use with the
Cummins Westport ISL G or the new Cummins Westport ISX12 G engines -
and a long-term fuel contract with Clean Energy into a package for
qualified customers.

The program is designed to achieve the following goals:

•

Deliver an attractive payback for truck customers utilizing the Cummins
Wesport ISL G or ISX12 G engine with a Westport LNG Tank System

•

Establish availability of long-term refueling contracts at a savings to
diesel for Clean Energy customers

"We know that customers are looking for efficient solutions that will
allow them to take advantage of the long term savings and environmental
benefits that natural gas will bring for their fleets," said James
Harger, Chief Marketing Officer, Clean Energy. "Collectively, we can
help get them on the road quickly and economically, while building out
America's Natural Gas Highway®."

Clean Energy has already completed 70 natural gas fueling stations as
part of America's Natural Gas Highway®, which will allow long-haul
trucks to travel across all major corridors through the United States,
and has more stations in development.

The Westport LNG Tank System is currently available in limited
quantities for customer trials, and can be ordered now with commercial
quantities available in September 2013. It operates on either cold or
warm LNG and is expected to provide customers with the ability to fuel
even the largest spark-ignited engines on a single or dual 120 gallon
tank, and deliver extended range and hold times while operating on cold
LNG. Attendees to MATS are invited to view the Westport LNG Tank System
which will be on display at the Clean Energy booth.

"The interest and demand is high for both the new Westport LNG Tank
System and the Cummins Westport ISX12 G," said Steve Anderson, Vice
President Business Development, Westport. "This collaborative program
allows us to give customers a good opportunity to invest in the most
advanced natural gas engine and fuel storage technology."

About Westport Innovations Inc.
Westport Innovations Inc. is a leading global supplier of proprietary
solutions that allow engines to operate on clean-burning fuels such as
compressed natural gas (CNG), liquefied natural gas (LNG), hydrogen,
and renewable natural gas (RNG) fuels such as landfill gas and help
reduce greenhouse gas emissions (GHG). Westport technology offers
advanced LNG fueling systems with direct injection natural gas engine
technology for heavy-duty vehicles such as highway trucks and off-road
applications such as mining and rail. Cummins Westport, our joint
venture with Cummins Inc., designs, engineers and markets spark-ignited
natural gas engines for medium- and heavy-duty transportation
applications such as trucks and buses. Westport is also one of the
global leaders for natural gas and liquefied petroleum gas (LPG) fuel
systems technology, design, and components in passenger cars,
light-duty trucks and industrial applications such as forklifts. To
learn more about our business, visit westport.com, subscribe to our RSS
feed, or follow us on Twitter @WestportDotCom.

About Clean Energy Fuels
Clean Energy (Nasdaq: CLNE) is the largest provider of natural gas fuel
for transportation in North America and a global leader in the
expanding natural gas vehicle fueling market. We have operations in
compressed natural gas (CNG) and liquefied natural gas (LNG) vehicle
fueling and construction and operation of natural gas fueling stations.
Wholly-owned subsidiaries include BAF Technologies, which provides
natural gas vehicle systems and conversions for taxis, vans, pick-up
trucks and shuttle buses; IMW Industries, Ltd., which supplies CNG
equipment for vehicle fueling and industrial applications worldwide;
NorthStar, which supplies LNG and liquefied to compressed natural gas
fueling system technologies and equipment, station construction and
operations; and Clean Energy Renewable Fuels (CERF), which develops
renewable natural gas (RNG), or biomethane, production facilities in
the U.S. For more information, visit www.cleanenergyfuels.com.

Note: This document contains forward-looking statements about Westport's
business, operations, technology development or the environment in
which it operates, which are based on Westport's estimates, forecasts
and projections. These statements include specifically, statements
regarding the abilities, capabilities and operation of the Westport LNG
Tank System. These statements are not guarantees of future
performance, are based on a number of assumptions and involve known and
unknown risks and uncertainties that are difficult to predict, or are
beyond Westport's control including the development of competing
products and technologies, availability and supply of natural gas,
price and supply of gasoline, timing of execution of agreements with
distributors and other counterparties, and other risk factors and
assumptions that may affect our actual results, performance or
achievements or that of the Westport LNG Tank System. Consequently,
readers should not place any undue reliance on such forward-looking
statements. In addition, these forward-looking statements relate to the
date on which they are made. Westport disclaims any intention or
obligation to update or revise any forward-looking statements, whether
as a result of new information, future events or otherwise except as
required by National Instrument 51-102. The contents of any website,
RSS feed or Twitter account referenced in this press release are not
incorporated by reference herein.

Forward-Looking Statements — This news release contains forward-looking
statements within the meaning of Section 27A of the Securities Act of
1933 and Section 21E of the Securities Exchange Act of 1934 that
involve risks, uncertainties and assumptions, including statements
about the deployment and cost of natural gas vehicles, the number and
location of stations to be included in America's Natural Gas Highway,
the timing for the completion of construction of these stations, and
the benefits of natural gas relative to diesel fuel. Actual results and
the timing of events could differ materially from those anticipated in
these forward-looking statements as a result of several factors,
including, but not limited to, the performance, availability and
benefits of natural gas trucks relative to gasoline and diesel trucks,
permitting or other delays encountered during the identification of
locations for, and the construction of, natural gas fueling stations,
including those stations planned for America's Natural Gas Highway, and
the price per gallon of natural gas fuel relative to diesel and
gasoline. The forward-looking statements made herein speak only as of
the date of this press release and, unless otherwise required by law,
the company undertakes no obligation to publicly update such
forward-looking statements to reflect subsequent events or
circumstances. Additionally, the reports and other documents Clean
Energy files with the SEC (available at www.sec.gov) contain risk factors, which may cause actual results to differ
materially from the forward-looking statements contained in this news
release.